[www] r296530 - Add LLD "Improve Code Layout" projects to the list of Open Projects
Sean Silva via llvm-commits
llvm-commits at lists.llvm.org
Tue Feb 28 18:18:35 PST 2017
Thanks for adding this, one comment inline:
On Tue, Feb 28, 2017 at 2:29 PM, Mehdi Amini via llvm-commits <
llvm-commits at lists.llvm.org> wrote:
> Author: mehdi_amini
> Date: Tue Feb 28 16:29:43 2017
> New Revision: 296530
>
> URL: http://llvm.org/viewvc/llvm-project?rev=296530&view=rev
> Log:
> Add LLD "Improve Code Layout" projects to the list of Open Projects
>
> Modified:
> www/trunk/OpenProjects.html
>
> Modified: www/trunk/OpenProjects.html
> URL: http://llvm.org/viewvc/llvm-project/www/trunk/
> OpenProjects.html?rev=296530&r1=296529&r2=296530&view=diff
> ============================================================
> ==================
> --- www/trunk/OpenProjects.html (original)
> +++ www/trunk/OpenProjects.html Tue Feb 28 16:29:43 2017
> @@ -42,6 +42,11 @@
> LLDB public API</a>
> </li>
> </ul>
> + <ul><a href="http://lldb.llvm.org/">LLD</a>
>
s/lldb/lld/ :)
-- Sean Silva
> + <li><a href="#lld_layout">Improve Code Layout</a>
> + </li>
> + </ul>
> +
> </li>
> <li><a href="#what">What is this?</a></li>
> <li><a href="#subprojects">LLVM Subprojects: Clang and more</a></li>
> @@ -436,6 +441,57 @@ Welcome prospective Google Summer of Cod
> </div>
>
> <!-- ***********************************************************************
> -->
> +<div class="www_subsection">
> + <a>LLD</a>
> +</div>
> +<!-- ***********************************************************************
> -->
> +
> +<!-- ***********************************************************************
> -->
> +<div class="www_subsubsection">
> + <a name="lld_layout">Improve Code Layout</a>
> +</div>
> +<!-- ***********************************************************************
> -->
> +
> +<div class="www_text">
> + <p><b>Description of the project: </b>
> + The goal for the project is trying to improve the
> layout/performances of the
> + generated executable. The primary object format considered for the
> project
> + is ELF but this can be extended to other object formats. The
> project will
> + touch both LLVM and lld.
> + <ul>
> + <li>Warm-up: lld already provides an option to
> (--symbol-ordering file)
> + which takes a symbol ordering file (presumably
> collected from a
> + profiler) and builds a layout. This aims to reduce
> startup times. It
> + would be nice to provide scripts to profile the
> applications/process
> + various profilers output to produce an order
> file/evaluate the
> + impact of the feature (as it has been tested only
> on a small class
> + of applications). There's already some work in the
> area but nothing
> + has been integrated in the LLVM build system for
> ELF. Ideally a
> + motivated student would do the
> benchmarking/analysis before the GSoC
> + starts to familiarize with the problem.</li>
> + <li>The meat: Use/extend profile informations generated by
> LLVM to help
> + the linker laying out functions. An obvious way
> (what gcc uses, [1])
> + is to pass values to the linker using special
> `.note` sections. The
> + linker then can reconstruct the call graph and
> apply an algorithm
> + like the one described in [2] (this is just a
> starting point, other
> + alternatives can be explored).</li>
> + </ul>
> + </p>
> + <p>
> + Possible extension: Xray can be used to provide data (it's unclear
> whether
> + this is feasible easily, see David's comment in [3]).
> + </p>
> + <p><b>Contact Person:</b>Davide Italiano</p>
> +
> + <ul>
> + <li>[1] http://sourceware.org/ml/binutils/2011-03/msg00043.html</li>
> + <li>[2] http://dl.acm.org/citation.cfm?id=93550</li>
> + <li>[3] http://lists.llvm.org/pipermail/llvm-dev/2017-
> January/109114.html</li>
> + </ul>
> +</div>
> +
> +
> +<!-- ***********************************************************************
> -->
> <div class="www_sectiontitle">
> <a name="what">What is this?</a>
> </div>
>
>
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